Year	Percent
1950	12.91907
1955	12.21198
1960	12.95039
1965	13.88413
1970	14.0406
1975	12.74767
1980	12.0006
1985	11.26091
1990	10.82667
1995	11.78799
2000	10.6813
2005	9.29335
2010	7.58631
2015	5.62686
2020	5.92478
2025	5.79273
2030	5.72098
2035	5.48295
2040	5.04782
2045	4.62937
2050	4.46234
2055	4.49259
2060	4.51205
2065	4.44242
2070	4.29965
2075	4.1647
2080	4.12769
2085	4.20408
2090	4.31356
2095	4.36853
2100	4.33725