Year	% of relevant age group
1971	17.5835
1972	19.93825
1973	20.22355
1974	20.32805
1975	19.8804
1976	20.58351
1977	20.18584
1978	22.538
1979	22.78164
1980	24.5907
1981	27.63691
1982	28.92744
1983	32.68356
1984	32.56406
1985	40.3179
1987	39.82923
1988	36.13116
1989	40.02142
1990	40.72875
1991	40.56018
1992	38.80073
1993	44.56382
1994	42.21829
1995	55.77928
1996	55.28519
1999	53.67593
2000	54.1274
2001	56.36332
2002	58.08758
2003	65.04788
2004	75.64735
2005	80.92553
2006	81.58709
2007	88.18197
2008	93.76374
2009	87.64244
2010	93.04386
2011	93.31308
2012	95.82937
2013	98.34788
2014	104.24473
2015	108.6318
2016	109.57798
2017	111.70716
2018	113.96378