Year	Percent
1950	31.88852
1955	29.4228
1960	27.35589
1965	26.43838
1970	26.1942
1975	27.24104
1980	28.92636
1985	27.96959
1990	26.84481
1995	25.86982
2000	26.15207
2005	27.85608
2010	29.57088
2015	30.41974
2020	30.56388
2025	30.25754
2030	30.35136
2035	30.79897
2040	31.32661
2045	31.60484
2050	31.40184
2055	30.96157
2060	30.60413
2065	30.35708
2070	30.14289
2075	29.82011
2080	29.35962
2085	28.84578
2090	28.34788
2095	27.90754
2100	27.47701