Year	Percent
1950	30.32496
1955	30.56248
1960	33.05791
1965	31.5329
1970	29.81061
1975	29.68992
1980	29.35129
1985	28.94073
1990	29.85318
1995	29.9465
2000	30.55363
2005	32.24427
2010	30.77733
2015	28.66092
2020	26.34419
2025	25.47662
2030	23.87953
2035	23.49705
2040	23.27893
2045	23.03278
2050	22.462
2055	22.2223
2060	22.154
2065	22.19716
2070	22.27083
2075	22.26656
2080	22.12135
2085	21.92912
2090	21.79347
2095	21.72318
2100	21.69043