Year	% of relevant age group
1972	59.55539
1973	59.95345
1974	67.19017
1975	68.75026
1976	71.0135
1977	72.68755
1978	76.5067
1979	79.32111
1980	82.65838
1981	85.03187
1982	85.94105
1983	83.12425
1984	81.10785
1985	79.90359
1986	77.90514
1987	77.83964
1988	76.87418
1989	78.08808
1990	75.78238
1991	74.94682
1992	75.15658
1993	76.26396
1994	76.50059
1995	79.41306
1996	80.13625
1997	87.27753
1998	84.42486
1999	85.47577
2000	89.17513
2001	94.2851
2002	97.09698
2003	98.97579
2004	101.7359
2005	105.9624
2006	105.3862
2007	108.0105
2008	110.2837
2009	108.2463
2010	106.2048
2011	108.23
2012	108.2059
2013	109.0483
2014	109.7424
2015	108.9214
2016	109.2285
2017	108.9696
2018	108.0301