Year	Percent
1950	12.11348
1955	11.35774
1960	10.51569
1965	11.12878
1970	12.18972
1975	12.48194
1980	11.42865
1985	10.82346
1990	10.17567
1995	10.92841
2000	10.89688
2005	10.58324
2010	9.59241
2015	6.86783
2020	5.56266
2025	5.88551
2030	5.78715
2035	5.7597
2040	5.56312
2045	5.14715
2050	4.73124
2055	4.56661
2060	4.60908
2065	4.64738
2070	4.60083
2075	4.4801
2080	4.36103
2085	4.33599
2090	4.41829
2095	4.52201
2100	4.56044