Year	% of relevant age group
1972	45.2878913879395
1973	53.6092300415039
1974	43.653980255127
1975	52.743709564209
1976	56.5498390197754
1977	58.7294311523438
1978	60.1605110168457
1979	66.5101928710938
1980	68.5851211547852
1981	69.3644638061523
1982	69.9380569458008
1983	68.4196014404297
1984	70.6808090209961
1985	70.8078765869141
1986	72.2242431640625
1987	72.9362564086914
1988	72.8146820068359
1989	67.1287689208984
1990	59.4893493652344
1991	51.3461685180664
1992	63.4836807250977
1993	63.228588104248
1994	53.7522010803223
1996	47.791618347168
1999	30.4950103759766
2001	53.7171897888184
2002	55.8758583068848
2003	51.7402114868164
2004	73.240348815918
2005	64.774543762207
2006	69.6171569824219
2007	69.7149429321289
2008	65.3784408569336
2009	64.537712097168
2010	65.7303771972656
2011	73.9123611450195
2012	76.591178894043
2015	74.3929977416992
2018	66.0260009765625