Year	Percent
1950	31.46722
1955	29.84824
1960	23.75801
1965	25.79339
1970	27.36064
1975	30.96064
1980	34.51374
1985	35.38943
1990	35.90586
1995	35.63642
2000	33.73699
2005	32.99909
2010	29.77936
2015	29.06133
2020	30.33436
2025	30.25374
2030	29.81845
2035	28.93306
2040	27.75716
2045	27.07026
2050	26.67682
2055	26.2165
2060	25.56439
2065	24.79427
2070	24.09534
2075	23.58773
2080	23.22297
2085	22.91108
2090	22.60143
2095	22.30237
2100	22.1044