Year	Percent
1950	8.82506
1955	8.83508
1960	9.78571
1965	10.18726
1970	11.13443
1975	11.99282
1980	12.40165
1985	9.67592
1990	9.31393
1995	9.56161
2000	11.15098
2005	9.54752
2010	7.3682
2015	6.19691
2020	6.28114
2025	6.6621
2030	6.6027
2035	5.99832
2040	5.44338
2045	5.15245
2050	5.16654
2055	5.31742
2060	5.37637
2065	5.26786
2070	5.09639
2075	5.00618
2080	5.03653
2085	5.13571
2090	5.19888
2095	5.17758
2100	5.10265