Year	Percent
1950	11.80247
1955	11.92336
1960	11.96862
1965	12.21967
1970	12.5575
1975	12.6843
1980	12.50696
1985	12.21502
1990	11.45738
1995	10.70463
2000	10.16012
2005	9.61172
2010	9.37138
2015	8.87888
2020	8.59192
2025	8.38994
2030	7.92118
2035	7.53736
2040	7.21552
2045	6.91105
2050	6.62265
2055	6.36838
2060	6.12863
2065	5.90851
2070	5.71976
2075	5.56459
2080	5.42045
2085	5.29582
2090	5.18633
2095	5.08883
2100	5.00638