Year	Percent
1950	14.09187
1955	14.06242
1960	12.56944
1965	13.38052
1970	13.92109
1975	14.28553
1980	14.24092
1985	14.1804
1990	13.90532
1995	14.41048
2000	14.52939
2005	14.54446
2010	14.06544
2015	13.77851
2020	13.38943
2025	13.07271
2030	12.66358
2035	12.14993
2040	11.59613
2045	11.07217
2050	10.60007
2055	10.15772
2060	9.7192
2065	9.28141
2070	8.86013
2075	8.47293
2080	8.11861
2085	7.78313
2090	7.45542
2095	7.15329
2100	6.86658