Year	Percent
1950	41.94887
1955	44.91134
1960	49.68062
1965	45.34314
1970	38.19382
1975	33.76146
1980	38.03992
1985	40.06381
1990	41.6359
1995	45.60306
2000	41.1379
2005	46.42845
2010	46.80015
2015	40.30381
2020	37.45229
2025	36.03125
2030	35.83707
2035	35.22
2040	34.11989
2045	33.444
2050	32.61698
2055	31.71941
2060	30.81468
2065	30.28951
2070	29.87567
2075	29.30741
2080	28.55159
2085	27.71219
2090	26.94308
2095	26.34855
2100	25.89228