Year	% of relevant age group
1972	13.9823303222656
1973	14.0479698181152
1974	14.0146999359131
1975	14.1529703140259
1976	14.2395496368408
1977	14.3588104248047
1978	14.599889755249
1979	14.8067398071289
1980	15.0798902511597
1981	15.3205900192261
1982	15.5932102203369
1983	15.79660987854
1984	16.0414199829102
1985	16.2292404174805
1986	16.3614597320557
1987	16.4345703125
1988	16.5436496734619
1989	16.6450099945068
1990	16.8646907806396
1991	17.2057704925537
1992	17.2818508148193
1993	17.591760635376
1994	17.6654205322266
1995	18.3195705413818
1996	18.518590927124
1997	18.7053508758545
1998	18.9402198791504
1999	19.29128074646
2000	19.891019821167
2001	20.7060604095459
2002	22.4938697814941
2003	24.0786399841309
2004	24.8370399475098
2005	25.8797492980957
2006	27.0528106689453
2007	28.3315200805664
2008	29.9502391815186
2009	31.3471202850342
2010	32.9019317626953
2011	34.3230094909668
2012	35.4441986083984
2013	36.1413497924805
2014	36.6635093688965
2015	37.7054100036621
2016	38.4829483032227
2017	39.1205215454102
2018	39.7058181762695
2019	40.077579498291
2020	40.701961517334