Year	% of relevant age group
1972	22.5046806335449
1973	22.5422191619873
1974	22.3871192932129
1975	23.0045604705811
1976	23.0380992889404
1977	23.1241397857666
1978	23.7541599273682
1979	24.1283493041992
1980	24.6694107055664
1981	24.9290409088135
1982	24.7557907104492
1983	24.7998504638672
1984	24.9938793182373
1985	25.0337104797363
1986	25.0172290802002
1987	24.4999198913574
1988	24.6304397583008
1989	24.5956897735596
1990	24.8707103729248
1991	24.9643707275391
1992	24.7833404541016
1993	25.4588203430176
1994	25.6378898620605
1995	26.456729888916
1996	26.5380001068115
1997	26.7559604644775
1998	26.9842090606689
1999	26.9984092712402
2000	27.3259906768799
2001	28.5519790649414
2002	30.7240505218506
2003	32.7837409973145
2004	33.8209609985352
2005	34.6853981018066
2006	35.7528610229492
2007	37.0221786499023
2008	39.0630416870117
2009	40.5481414794922
2010	42.009349822998
2011	43.3372497558594
2012	44.0505104064941
2013	44.2904205322266
2014	45.392879486084
2015	45.8342208862305
2016	45.9860610961914
2017	46.0319519042969
2018	46.1110801696777
2019	45.9938812255859
2020	46.1624794006348