Year	Percent
1950	9.94329
1955	11.37578
1960	11.59449
1965	11.86035
1970	11.21775
1975	9.71936
1980	9.17893
1985	8.64551
1990	8.31036
1995	7.99166
2000	8.19584
2005	7.20289
2010	6.68003
2015	7.0215
2020	6.59328
2025	6.2531
2030	5.99432
2035	5.7091
2040	5.48234
2045	5.36639
2050	5.30339
2055	5.21892
2060	5.10096
2065	4.98789
2070	4.89408
2075	4.83249
2080	4.80169
2085	4.77406
2090	4.73638
2095	4.68596
2100	4.6416