Year	Percent
1950	28.14909
1955	26.38199
1960	25.13786
1965	24.80617
1970	25.47335
1975	28.84997
1980	33.22381
1985	33.38285
1990	33.38442
1995	38.61103
2000	37.81155
2005	38.50506
2010	49.44202
2015	55.4217
2020	56.90417
2025	50.0861
2030	42.8446
2035	37.00863
2040	34.92781
2045	34.0698
2050	30.60442
2055	26.96035
2060	24.12397
2065	22.82616
2070	22.61065
2075	22.67928
2080	22.64678
2085	22.37384
2090	22.0166
2095	21.80799
2100	21.84162