Year	% of relevant age group
1972	49.59554
1973	50.32472
1974	50.57723
1975	55.90226
1976	59.41453
1977	60.49124
1978	65.00163
1979	63.66329
1980	66.62561
1981	68.04964
1982	68.60292
1983	67.33077
1984	66.87971
1985	67.60891
1986	68.18349
1987	67.65367
1988	66.4752
1989	68.03708
1990	66.37204
1991	65.38259
1992	67.3039
1993	67.95082
1994	68.80545
1995	74.62825
1996	75.88822
1997	87.45477
1998	84.80153
1999	82.58703
2000	90.83155
2001	95.40934
2002	101.9995
2003	103.8487
2004	106.9409
2005	112.3014
2006	113.0993
2007	115.9053
2008	122.5322
2009	120.0552
2010	119.6299
2011	122.7087
2012	121.7889
2013	122.8275
2014	123.4058
2015	121.3281
2016	121.3109
2017	120.2542
2018	119.3295