Year	Percent
1950	11.2378
1955	10.57617
1960	12.24155
1965	13.3841
1970	13.61562
1975	12.68198
1980	12.17663
1985	12.43486
1990	13.25951
1995	15.12909
2000	14.4901
2005	11.74471
2010	11.96462
2015	12.03169
2020	12.23259
2025	11.70387
2030	10.93013
2035	10.1649
2040	9.68349
2045	9.40049
2050	9.07319
2055	8.58182
2060	8.00779
2065	7.49504
2070	7.10266
2075	6.78393
2080	6.49997
2085	6.19875
2090	5.91509
2095	5.67907
2100	5.50761