Year	Percent
1950	13.04477
1955	13.41268
1960	13.31355
1965	13.31828
1970	13.99872
1975	13.2335
1980	12.26403
1985	11.1357
1990	11.4934
1995	11.694
2000	10.87383
2005	9.62423
2010	9.0271
2015	8.83252
2020	9.27218
2025	8.91369
2030	8.27362
2035	7.76999
2040	7.47091
2045	7.26565
2050	7.026
2055	6.75842
2060	6.48946
2065	6.23311
2070	6.01134
2075	5.82886
2080	5.69243
2085	5.56912
2090	5.43849
2095	5.32356
2100	5.22012