Year	Percent
1950	28.8384
1955	27.92871
1960	26.7558
1965	25.81481
1970	24.43951
1975	25.21119
1980	26.25571
1985	26.61199
1990	27.54858
1995	28.4804
2000	29.79025
2005	31.83533
2010	33.61312
2015	34.44559
2020	34.22364
2025	33.01512
2030	31.75427
2035	30.47445
2040	29.24135
2045	27.99637
2050	26.515
2055	25.08255
2060	23.80453
2065	22.78227
2070	21.97935
2075	21.35724
2080	20.84225
2085	20.42477
2090	20.09807
2095	19.85065
2100	19.69134