Year	Percent
1950	12.02662
1955	9.69333
1960	7.52749
1965	8.56608
1970	9.18011
1975	9.84339
1980	10.24363
1985	9.56576
1990	9.07788
1995	8.02688
2000	8.01718
2005	8.48348
2010	8.86832
2015	8.70103
2020	8.22216
2025	7.44395
2030	7.06871
2035	6.90591
2040	6.81342
2045	6.61982
2050	6.32764
2055	6.01226
2060	5.74664
2065	5.5742
2070	5.46836
2075	5.36317
2080	5.22112
2085	5.06926
2090	4.9381
2095	4.86083
2100	4.82033