Year	Percent
1950	26.98319
1955	25.1989
1960	22.58558
1965	21.79335
1970	23.39728
1975	26.11428
1980	27.76456
1985	29.1077
1990	28.28247
1995	29.15687
2000	30.88199
2005	32.50843
2010	32.26634
2015	27.78145
2020	24.49214
2025	22.85578
2030	23.53645
2035	24.90075
2040	25.28476
2045	24.48268
2050	22.9831
2055	21.95025
2060	21.87136
2065	22.3943
2070	22.89748
2075	22.88481
2080	22.34449
2085	21.65374
2090	21.19893
2095	21.11271
2100	21.22137