Year	Percent
1950	29.22824
1955	28.46652
1960	28.22404
1965	27.40831
1970	27.48727
1975	28.78295
1980	29.9478
1985	31.52172
1990	32.42268
1995	32.72461
2000	33.15551
2005	33.73031
2010	34.04337
2015	33.85873
2020	33.10578
2025	31.45384
2030	29.68071
2035	28.21887
2040	26.65793
2045	25.40746
2050	24.49633
2055	23.53491
2060	22.69051
2065	22.0398
2070	21.60132
2075	21.31214
2080	21.12168
2085	20.99275
2090	20.88051
2095	20.79897
2100	20.74967