The following table appears on the CAIN (Conflict Archive on the INternet) web site:
http://cain.ulst.ac.uk/ni/security/security.htm

Table NI-SEC-01:  Strength (number) of the RUC, and the UDR / RIR, 1938, 1971 to 2010-11	
Year	RUC / PSNI Total 1	RUC / PSNI Males	RUC / PSNI Females	RUC / PSNI Reserve Total	RUC / PSNI Reserve Full- Time	RUC / PSNI Reserve Part- Time	UDR / RIR Total	UDR / RIR Full- Time	UDR / RIR Part- Time	
1938	2820	2820	-	-	-	-	-	-	-	
1971	4086	3942	144	1284	-	1284	323	323	-	
1972	4257	4078	179	2134	153	1981	844	844	-	
1973	4391	4172	219	2514	290	2224	7894	817	7077	
1974	4565	4283	282	3860	510	3350	7702	1290	6412	
1975	4902	4549	353	4819	661	4158	7765	1531	6234	
1976	5253	4811	442	4697	870	3827	7668	1630	6038	
1977	5692	5140	552	4686	1002	3684	7843	2035	5808	
1978	6110	5495	615	4608	1188	3420	7744	2407	5337	
1979	6614	5938	676	4513	1304	3209	7414	2530	4884	
1980	6935	6224	711	4752	1685	3067	7259	2412	4847	
1981	7334	6622	712	4870	2060	2810	7294	2745	4549	
1982	7718	7017	701	4840	2174	2666	7111	2793	4318	
1983	8003	7328	675	4493	2295	2198	6925	2690	4235	
1984	8127	7487	640	4439	2532	1907	6468	2689	3779	
1985	8259	7610	649	4508	2755	1753	6494	2755	3739	
1986	8234	7581	653	4414	2754	1660	6408	2672	3736	
1987	8236	7591	645	4650	2991	1659	6531	2785	3746	
1988	8227	7568	659	4649	2993	1656	6393	2858	3535	
1989	8259	7571	688	4623	3018	1605	6230	2947	3283	
1990	8243	7535	708	4544	2990	1554	6043	2955	3088	
1991	8222	7514	708	4560	3042	1518	6276	3277	2999	
1992	8478	7687	791	4593	3160	1433	5417	2797	2620	
1993	8464	7646	818	4572	3184	1388	5412	2902	2510	
1994	8493	7640	853	4690	3199	1491	5241	2956	2285	
1995	8440	7541	899	4419	2938	1481	n/a	n/a	n/a	
1996	8428	7531	897	4402	2929	1473	n/a	n/a	n/a	
1997	8485	7562	923	4306	2982	1324	n/a	n/a	n/a	
1997-98 2	8505	7580	925	4274	2975	1299	n/a	n/a	n/a	
1998-99	8496	7534	962	4079	2862	1217	n/a	n/a	n/a	
1999-00	8393	7406	987	3840	2688	1152	n/a	n/a	n/a	
2000-01	7894	6916	978	3365	2293	1072	n/a	n/a	n/a	
2001-02	6976	6058	918	3185	2184	1001	n/a	n/a	n/a	
2002-03 3	6940	5908	1032	2733	1804	929	n/a	n/a	n/a	
2003-04	7212	6027	1185	2436	1572	864	n/a	n/a	n/a	
2004-05	7233	5940	1293	2309	1366	943	n/a	n/a	n/a	
2005-06	7299	5875	1424	1841	1015	826	n/a	n/a	n/a	
2006-07	7314	5789	1525	1634	751	883	n/a	n/a	n/a	
2007-08 4	7267	5674	1593	1501	664	837				
2008-09	7203	5539	1664	1275	515	760				
2009-10	7183	5411	1772	1085	382	703				
2010-11	7020	5210	1810	880	229	651				
Notes:	
1. The Royal Ulster Constabulary became the Police Service of Northern Ireland on 4 November 2001	
2. From 1 April 1998 the RUC compiled and published its statistics on a financial year basis (31 March)	
3. From 2002-03 figures exclude those on secondments and those student officers who have yet to graduate	
4. The British Army's 'Operation Banner' ended in July 2007 when troops returned to barracks	
PSNI - Police Service of Northern Ireland	
RUC - Royal Ulster Constabulary	
UDR - Ulster Defence Regiment (A regiment of the British Army recruited in Northern Ireland, 1 April 1970 to July 1992)	
RIR - Royal Irish Regiment (Established from the merger of the UDR and the Royal Irish Rangers in July 1992)	
n/a - Figures not available	
Sources:	
Royal Ulster Constabulary (RUC). (2001) Chief Constable's Annual Report, 2000/01.	
Police Service of Northern Ireland (PSNI). (2003) Chief Constable's Annual Report, 2002/03.	
Northern Ireland Statistics and Research Agency (2002). Northern Ireland Annual Abstract of Statistics, 1999 and 2002 (and 1989, 1995).	
Table also available as:	
Rich Text Format (RTF) Document; Microsoft Excel Document