Year	Percent
1950	11.86535
1955	11.59473
1960	11.91552
1965	11.75219
1970	11.62753
1975	11.60683
1980	13.38502
1985	11.41898
1990	10.31206
1995	9.75632
2000	10.06744
2005	9.39471
2010	8.12188
2015	7.58798
2020	7.55993
2025	7.29986
2030	7.01472
2035	6.75223
2040	6.4868
2045	6.23078
2050	6.03362
2055	5.90229
2060	5.7931
2065	5.67721
2070	5.54508
2075	5.42301
2080	5.32812
2085	5.26015
2090	5.21038
2095	5.16083
2100	5.10727