Year	Percent
1950	12.05213
1955	11.59539
1960	11.43593
1965	12.28846
1970	12.68016
1975	12.75286
1980	12.4392
1985	12.46136
1990	12.11394
1995	11.03567
2000	10.67456
2005	11.18216
2010	10.74105
2015	9.0468
2020	8.18333
2025	7.68037
2030	7.47391
2035	7.06095
2040	6.54751
2045	6.03666
2050	5.61492
2055	5.3321
2060	5.14785
2065	4.97851
2070	4.79474
2075	4.61035
2080	4.47464
2085	4.39648
2090	4.36906
2095	4.35534
2100	4.33611