Year	Percent
1950	27.91715
1955	26.36762
1960	25.9505
1965	24.8805
1970	25.71014
1975	27.92778
1980	28.76077
1985	30.80644
1990	32.03194
1995	31.91639
2000	31.98111
2005	33.21376
2010	34.34531
2015	36.48042
2020	36.72414
2025	34.58675
2030	31.30919
2035	28.65873
2040	27.36319
2045	27.07376
2050	26.97
2055	26.30433
2060	25.18538
2065	23.99432
2070	23.20026
2075	22.93289
2080	22.95515
2085	22.92118
2090	22.63111
2095	22.15871
2100	21.7324