Year	Percent
1950	30.71322
1955	29.70273
1960	28.37993
1965	26.98868
1970	25.54618
1975	25.51945
1980	26.05505
1985	26.56014
1990	27.15589
1995	27.41116
2000	27.86338
2005	28.90356
2010	29.98657
2015	30.58858
2020	30.84426
2025	30.81192
2030	30.90975
2035	31.33633
2040	31.65502
2045	31.72076
2050	31.48171
2055	31.04795
2060	30.70155
2065	30.45067
2070	30.21796
2075	29.91982
2080	29.55067
2085	29.13842
2090	28.74663
2095	28.37504
2100	27.98969