Detection, Conviction and Punishment, 1950 - 2000
			% of offences	% of all offences
		% of crimes	leading to	resulting in
		cleared up	cautions or	immediate
	Date		guilty verdicts	custody
	1950	44.6	21.5	5.4
	1955	48.7	23.7	4.6
	1960	44.9	25.5	3.5
	1965	39.2	19.3	3.1
	1970	45.0	25.6	2.7
	1975	44.0	24.0	2.4
	1980	37.0	20.7	2.4
	1985	34.0	16.3	2.2
	1990	30.0	11.2	1.1
	1995	25.0	9.9	1.2
	2000	25.0	9.0	1.5