Year	Percent
1950	21.44353
1955	21.3606
1960	19.48032
1965	20.25216
1970	22.02787
1975	24.19091
1980	25.84066
1985	24.32059
1990	24.08036
1995	24.92298
2000	26.25267
2005	27.45233
2010	27.43265
2015	26.25763
2020	26.45021
2025	26.87371
2030	27.64066
2035	27.62438
2040	27.00542
2045	26.60671
2050	25.49417
2055	24.68534
2060	24.30756
2065	23.97313
2070	23.9439
2075	23.8643
2080	23.64159
2085	23.3592
2090	23.14978
2095	23.04068
2100	22.96742