Year	Percent
1950	13.53792
1955	12.84434
1960	13.53279
1965	13.92144
1970	13.50199
1975	14.85157
1980	16.10027
1985	16.06668
1990	14.84854
1995	14.35741
2000	14.06229
2005	13.81935
2010	13.76323
2015	13.59402
2020	12.81987
2025	11.8282
2030	11.17066
2035	10.74259
2040	10.36842
2045	9.9545
2050	9.48142
2055	8.97721
2060	8.5381
2065	8.15172
2070	7.82194
2075	7.49032
2080	7.15878
2085	6.83565
2090	6.54203
2095	6.28338
2100	6.07497