Year	% of relevant age group
1971	82.53498
1972	74.27274
1973	83.25645
1974	87.77624
1975	72.4084
1976	88.23939
1977	73.16384
1978	74.64485
1979	73.08751
1980	56.35069
1981	61.05484
1982	68.69911
1983	78.16135
1984	76.67845
1985	80.53555
1986	88.62507
1987	87.09331
1988	80.43665
1989	84.76865
1990	82.13439
1991	77.5157
1992	75.83396
1993	101.13414
1994	102.0059
1995	98.6687
1996	100.43921
1997	98.41713
1999	85.43912
2000	101.12251
2001	99.94186
2002	98.31575
2003	98.97751
2004	100.86846
2005	101.76911
2006	104.77416
2007	106.05478
2008	103.2748
2009	106.22739
2010	100.8858
2011	100.94275
2012	101.07257
2013	100.24439
2014	98.33257
2015	96.00344
2016	97.30626
2017	97.71382