Year	Percent
1950	12.51082
1955	11.43931
1960	10.9055
1965	13.49704
1970	13.53341
1975	13.0558
1980	12.62608
1985	12.70122
1990	13.33496
1995	13.51283
2000	12.30782
2005	11.58869
2010	10.69629
2015	9.77369
2020	9.53362
2025	9.72935
2030	9.12984
2035	8.4562
2040	7.84392
2045	7.39811
2050	7.09966
2055	6.86769
2060	6.62466
2065	6.36099
2070	6.11637
2075	5.91952
2080	5.78467
2085	5.68948
2090	5.60746
2095	5.514
2100	5.42139