Year	Percent
1950	29.49915
1955	29.12278
1960	28.26987
1965	27.57126
1970	26.96065
1975	26.45868
1980	24.28767
1985	23.98977
1990	27.68489
1995	29.81678
2000	31.50772
2005	30.86331
2010	30.95114
2015	32.38347
2020	33.17401
2025	33.23499
2030	32.73075
2035	32.5028
2040	32.42893
2045	32.49534
2050	32.31705
2055	31.4753
2060	30.65995
2065	30.00283
2070	29.48179
2075	28.96952
2080	28.37201
2085	27.68046
2090	26.96539
2095	26.31895
2100	25.77556