Year	% of relevant age group
1970	80.7121
1971	80.45728
1972	81.76746
1973	75.37225
1974	78.75352
1975	80.61274
1976	83.08245
1977	81.79656
1978	81.69887
1979	88.09256
1980	88.84
1981	90.26934
1982	87.44075
1983	87.06114
1984	88.03631
1985	88.72368
1986	88.72387
1987	84.73374
1988	84.22691
1989	85.08727
1990	84.17397
1991	83.32051
1992	84.12393
1993	85.12878
1994	83.66851
1995	85.09531
1996	86.46922
1997	87.11289
1998	88.38458
1999	82.93801
2000	93.08677
2001	97.35055
2002	100.0735
2003	102.5303
2004	101.1977
2005	100.1285
2006	103.4915
2007	105.061
2008	108.8131
2009	108.5621
2010	108.7979
2011	111.682
2012	112.8885
2013	113.001
2014	113.0241
2015	113.7792
2016	114.3661
2017	114.287
2018	114.7663