Year	Percent
1950	13.30973
1955	13.62176
1960	13.86368
1965	14.11471
1970	14.50258
1975	14.83749
1980	15.18965
1985	15.38419
1990	15.38564
1995	15.322
2000	14.19034
2005	13.87232
2010	14.22329
2015	14.21637
2020	13.60834
2025	12.90332
2030	12.3578
2035	11.9817
2040	11.61618
2045	11.21264
2050	10.78317
2055	10.34861
2060	9.97741
2065	9.62753
2070	9.31933
2075	9.00376
2080	8.68775
2085	8.39372
2090	8.12195
2095	7.84534
2100	7.60346