Year	Percent
1950	26.09633
1955	26.18702
1960	24.76361
1965	23.27213
1970	22.56851
1975	22.68477
1980	23.85479
1985	24.67816
1990	25.86543
1995	26.12609
2000	27.39274
2005	28.81544
2010	29.74845
2015	29.64671
2020	28.73835
2025	27.67348
2030	26.44468
2035	26.07992
2040	25.65169
2045	24.47672
2050	23.51975
2055	23.0834
2060	23.31112
2065	23.72732
2070	23.94114
2075	23.75831
2080	23.29131
2085	22.89511
2090	22.69957
2095	22.67503
2100	22.67244