Year	Percent
1950	13.40549
1955	12.41151
1960	13.57908
1965	13.89701
1970	14.24744
1975	13.9566
1980	13.34796
1985	13.955
1990	15.33043
1995	14.65554
2000	13.7702
2005	13.09659
2010	12.2277
2015	11.64244
2020	10.91027
2025	10.34042
2030	9.73556
2035	9.16741
2040	8.66532
2045	8.21779
2050	7.83976
2055	7.47895
2060	7.17709
2065	6.90858
2070	6.69822
2075	6.52831
2080	6.38203
2085	6.24664
2090	6.12974
2095	6.03154
2100	5.94671