Year	Percent
1950	9.37038
1955	10.13741
1960	8.67869
1965	6.63561
1970	7.27438
1975	7.84321
1980	8.6481
1985	6.42838
1990	6.3098
1995	6.18441
2000	5.22314
2005	5.10598
2010	5.25069
2015	4.94124
2020	4.89643
2025	4.84727
2030	4.79233
2035	4.68152
2040	4.63789
2045	4.65937
2050	4.66996
2055	4.68395
2060	4.70479
2065	4.71224
2070	4.71072
2075	4.71414
2080	4.72694
2085	4.74154
2090	4.74657
2095	4.73671
2100	4.72041