Year	Percent
1950	9.18901
1955	7.27136
1960	9.64907
1965	10.30289
1970	8.42315
1975	7.83144
1980	7.68684
1985	7.93418
1990	8.11565
1995	7.79064
2000	7.32887
2005	6.71678
2010	6.05263
2015	5.92165
2020	5.53357
2025	5.42828
2030	5.41634
2035	5.36641
2040	5.26928
2045	5.1673
2050	5.08645
2055	5.03068
2060	5.02617
2065	5.03594
2070	5.01951
2075	4.98665
2080	4.9469
2085	4.92543
2090	4.92321
2095	4.92392
2100	4.90701