Year	Percent
1950	11.69517
1955	9.92052
1960	8.79297
1965	8.17024
1970	7.14991
1975	6.06015
1980	6.3348
1985	6.27767
1990	5.91958
1995	6.10207
2000	5.43306
2005	5.17899
2010	5.39658
2015	5.26326
2020	5.29481
2025	5.23071
2030	5.09861
2035	5.00755
2040	5.02017
2045	5.08469
2050	5.12089
2055	5.10457
2060	5.05654
2065	4.99338
2070	4.95124
2075	4.93056
2080	4.91615
2085	4.89059
2090	4.84429
2095	4.78845
2100	4.73608