Year	% of relevant age group
1970	61.75424
1971	61.69633
1972	62.26627
1973	64.2694
1974	61.48107
1975	69.71833
1976	73.83769
1977	74.91909
1978	74.94485
1979	83.89591
1980	78.84775
1981	77.1069
1982	78.47286
1983	80.88104
1984	82.4089
1985	82.01625
1986	86.83743
1987	85.84526
1988	85.3734
1989	85.07305
1990	86.11438
1991	88.22655
1992	88.03202
1993	86.85781
1994	86.39934
1995	85.68237
1996	87.26708
1997	87.98605
1998	90.07505
1999	93.38852
2000	94.51843
2001	95.42311
2002	98.59931
2003	98.69097
2004	99.19996
2005	100.4472
2006	100.9644
2007	102.3606
2008	102.0273
2009	102.583
2010	103.325
2011	104.1538
2012	104.5894
2013	103.8147
2014	103.2791
2015	102.0678
2016	101.4091
2017	102.4371
2018	101.8333