Year	Percent
1950	27.5322
1955	26.85336
1960	27.25973
1965	25.15873
1970	25.30358
1975	25.9165
1980	27.55185
1985	29.59154
1990	29.39892
1995	28.67842
2000	26.99565
2005	25.50682
2010	25.0329
2015	25.11093
2020	24.33854
2025	23.33971
2030	22.77969
2035	22.42456
2040	22.62144
2045	22.80387
2050	22.61426
2055	22.36
2060	22.10637
2065	21.99869
2070	22.02428
2075	22.07964
2080	22.01748
2085	21.81335
2090	21.5466
2095	21.30806
2100	21.14254