Year	Percent
1950	11.53607
1955	11.73803
1960	12.54929
1965	11.62541
1970	12.82251
1975	13.36717
1980	12.01774
1985	10.12229
1990	10.31788
1995	10.60826
2000	10.34948
2005	9.6268
2010	8.70758
2015	7.52421
2020	7.16178
2025	6.68246
2030	6.29421
2035	5.88095
2040	5.54186
2045	5.2705
2050	5.06421
2055	4.93527
2060	4.8315
2065	4.74068
2070	4.65285
2075	4.59975
2080	4.57401
2085	4.57268
2090	4.58247
2095	4.58396
2100	4.57836