Year	% of relevant age group
1971	52.8713989257812
1972	47.9932289123535
1973	51.3589401245117
1974	53.850269317627
1975	55.4217681884766
1976	55.4075813293457
1977	56.940990447998
1978	57.0615997314453
1979	57.4977111816406
1980	58.676929473877
1981	59.8893394470215
1982	60.1384696960449
1983	59.7581405639648
1984	59.3572616577148
1985	60.6173706054688
1986	62.2087898254395
1987	63.8193893432617
1988	66.404167175293
1989	65.703971862793
1990	67.4476089477539
1991	65.6777191162109
1992	65.7848815917969
1999	62.4997291564941