Year	Percent
1950	30.62425
1955	28.85665
1960	24.76857
1965	26.17502
1970	26.8649
1975	30.10029
1980	32.72171
1985	33.75411
1990	35.34125
1995	34.86018
2000	35.46249
2005	34.17253
2010	30.55775
2015	29.24249
2020	29.75175
2025	29.13197
2030	28.0651
2035	26.6786
2040	25.61686
2045	24.91697
2050	24.54105
2055	24.20893
2060	23.75318
2065	23.21574
2070	22.71166
2075	22.35047
2080	22.09851
2085	21.88732
2090	21.64691
2095	21.39431
2100	21.17545