Year	% of relevant age group
1970	66.83306
1971	67.06698
1972	68.35605
1973	68.51808
1974	76.02285
1975	78.02005
1976	80.27664
1977	81.99988
1978	86.09339
1979	88.47155
1980	91.46323
1981	93.91192
1982	94.58566
1983	91.49309
1984	88.99407
1985	87.72359
1986	85.6132
1987	84.71437
1988	84.89853
1989	84.6071
1990	82.90713
1991	81.65037
1992	81.61837
1993	83.19146
1994	83.62146
1995	86.78911
1996	87.82862
1997	94.68979
1998	91.59802
1999	91.92884
2000	95.67684
2001	100.9003
2002	103.6588
2003	104.7023
2004	107.0515
2005	111.1116
2006	110.2372
2007	112.7287
2008	114.9946
2009	112.2208
2010	110.4941
2011	113.3729
2012	112.7691
2013	113.4181
2014	114.495
2015	114.1366
2016	114.2507
2017	114.0794
2018	112.9245