Year	Percent
1950	28.81634
1955	27.87201
1960	26.95184
1965	26.08396
1970	25.74463
1975	27.18071
1980	29.01618
1985	28.53712
1990	28.23803
1995	27.73289
2000	26.59513
2005	30.16112
2010	31.95295
2015	33.75826
2020	35.92269
2025	31.87837
2030	31.62894
2035	30.45003
2040	30.03519
2045	29.95251
2050	29.10898
2055	28.01359
2060	27.03944
2065	26.39785
2070	25.89127
2075	25.30292
2080	24.60102
2085	23.91378
2090	23.36243
2095	22.93724
2100	22.56712