Year	Percent
1950	28.305
1955	28.15996
1960	27.87586
1965	27.30836
1970	26.91642
1975	26.95368
1980	25.53333
1985	24.94505
1990	25.37719
1995	26.25069
2000	27.16044
2005	28.56526
2010	29.29487
2015	29.48851
2020	29.41279
2025	29.32153
2030	29.81317
2035	30.65916
2040	31.23099
2045	31.40148
2050	31.11433
2055	30.62899
2060	30.35597
2065	30.20608
2070	30.03356
2075	29.73034
2080	29.29701
2085	28.81889
2090	28.37036
2095	27.96436
2100	27.58045