Year	Percent
1950	12.21228
1955	11.88853
1960	11.60064
1965	11.93127
1970	12.59892
1975	12.7246
1980	12.69024
1985	12.67414
1990	12.66159
1995	12.6729
2000	12.45077
2005	12.17158
2010	11.93774
2015	11.64525
2020	11.54795
2025	11.54147
2030	11.21322
2035	10.84866
2040	10.50126
2045	10.20679
2050	9.95576
2055	9.70883
2060	9.44988
2065	9.18217
2070	8.92508
2075	8.68655
2080	8.45993
2085	8.2417
2090	8.04236
2095	7.85121
2100	7.63563