Year	Percent
1950	12.6527
1955	12.55751
1960	13.94397
1965	13.77506
1970	13.69751
1975	13.70704
1980	13.72511
1985	13.86047
1990	13.63283
1995	13.05314
2000	12.54897
2005	12.12062
2010	11.41811
2015	10.64051
2020	9.88074
2025	9.46032
2030	9.01417
2035	8.55019
2040	8.07807
2045	7.63471
2050	7.22985
2055	6.87532
2060	6.55648
2065	6.27269
2070	6.01422
2075	5.78868
2080	5.59231
2085	5.43073
2090	5.29274
2095	5.17206
2100	5.06846