Year	Percent
1950	9.64988
1955	10.88411
1960	11.70661
1965	12.46087
1970	12.41538
1975	9.73173
1980	9.92274
1985	7.95404
1990	7.65779
1995	7.2991
2000	7.16741
2005	6.5357
2010	6.36703
2015	6.11274
2020	5.95338
2025	5.758
2030	5.60489
2035	5.49157
2040	5.42208
2045	5.39591
2050	5.38697
2055	5.37079
2060	5.34884
2065	5.31549
2070	5.28917
2075	5.26258
2080	5.23914
2085	5.20567
2090	5.1647
2095	5.12306
2100	5.08373