Year	% of relevant age group
1971	9.99711990356445
1972	9.0342903137207
1973	9.33707046508789
1974	10.086799621582
1976	11.3016395568848
1977	13.4516496658325
1978	12.477499961853
1979	13.1329698562622
1980	11.6565799713135
1981	11.2460899353027
1983	11.3584299087524
1984	10.8568801879883
1985	10.3096399307251
1986	9.46370029449463
1987	9.29086971282959
1988	8.87318992614746
2000	28.6628398895264
2001	32.5493698120117
2002	33.6304588317871
2003	36.9321594238281
2004	38.464958190918
2005	40.2724189758301
2006	45.5662803649902
2007	48.3464584350586
2008	51.5832901000977
2009	53.249828338623
2010	56.0999298095703
2011	56.5069389343262
2012	52.1180191040039
2013	51.8661117553711
2014	50.7712593078613
2015	48.5098495483398
2016	48.5724182128906
2017	46.9308013916016