Year	Percent
1950	9.1675
1955	10.74454
1960	10.56917
1965	11.00932
1970	10.45674
1975	9.66828
1980	9.19901
1985	7.62041
1990	7.18124
1995	7.48557
2000	7.4419
2005	6.75558
2010	6.29219
2015	6.52286
2020	6.22365
2025	6.03696
2030	5.87033
2035	5.67185
2040	5.4692
2045	5.34162
2050	5.27984
2055	5.22289
2060	5.16353
2065	5.08369
2070	4.99582
2075	4.91803
2080	4.86104
2085	4.81622
2090	4.77737
2095	4.73171
2100	4.68327