Year	% of relevant age group
1974	70.06376
1975	71.60167
1976	73.73147
1977	75.81845
1978	78.28203
1979	80.35275
1980	82.4192
1981	86.30073
1982	88.12937
1983	85.5647
1984	85.81043
1985	84.98051
1986	84.82867
1987	84.45344
1988	82.97209
1989	82.39152
1990	81.77795
1991	81.3758
1992	81.82297
1993	82.64265
1994	82.97512
1995	84.98978
1996	85.98869
1997	91.02345
1998	89.98198
1999	88.93494
2000	94.26169
2001	97.76338
2002	100.8345
2003	102.3563
2004	103.4043
2005	106.4175
2006	106.5506
2007	107.1003
2008	108.8173
2009	108.4784
2010	107.6467
2011	109.7059
2012	109.8615
2013	109.7397
2014	110.063
2015	109.1655
2016	109.6757
2017	108.8402
2018	108.4509