Year	% of relevant age group
1970	63.28813
1971	63.46187
1972	63.75429
1973	64.31069
1974	62.64784
1975	68.70834
1976	72.02358
1977	72.99381
1978	77.87574
1979	75.87811
1980	78.68195
1981	80.60713
1982	79.17544
1983	77.82508
1984	77.01195
1985	78.21476
1986	78.33441
1987	76.69978
1988	76.48215
1989	77.48666
1990	75.09137
1991	73.7691
1992	75.0164
1993	75.6854
1994	77.64277
1995	83.91425
1996	85.93856
1997	96.80194
1998	94.2672
1999	90.2036
2000	99.02558
2001	103.3574
2002	110.0975
2003	111.5603
2004	113.5834
2005	118.2031
2006	118.3795
2007	121.3487
2008	127.9153
2009	124.8
2010	124.5753
2011	127.8653
2012	126.2708
2013	127.1964
2014	128.3034
2015	126.8801
2016	126.6702
2017	125.5735
2018	124.3246