Year	Percent
1950	28.69191
1955	29.54949
1960	30.85212
1965	30.31381
1970	30.23148
1975	31.38266
1980	31.7122
1985	32.3355
1990	32.14834
1995	30.0402
2000	29.71705
2005	29.76077
2010	29.98679
2015	29.91887
2020	28.39115
2025	26.16972
2030	23.79637
2035	22.19638
2040	21.81269
2045	21.7667
2050	21.84203
2055	21.42625
2060	20.82703
2065	20.40282
2070	20.373
2075	20.66988
2080	20.99402
2085	21.08429
2090	20.90137
2095	20.6202
2100	20.4568