Year	Percent
1950	12.28314
1955	12.04434
1960	12.40932
1965	12.20709
1970	12.87089
1975	13.84454
1980	12.46139
1985	11.83255
1990	10.22161
1995	10.68557
2000	9.86588
2005	9.13967
2010	8.48929
2015	6.72198
2020	6.9823
2025	6.91594
2030	6.6834
2035	6.41814
2040	6.08531
2045	5.7342
2050	5.51227
2055	5.48017
2060	5.50165
2065	5.44809
2070	5.33551
2075	5.21383
2080	5.13004
2085	5.10296
2090	5.1131
2095	5.11519
2100	5.08043