Year	Percent
1950	11.87978
1955	11.74411
1960	11.80742
1965	13.66065
1970	13.40427
1975	13.1344
1980	12.71748
1985	12.30037
1990	12.12068
1995	11.96112
2000	11.91765
2005	11.4888
2010	10.99949
2015	10.28213
2020	9.89059
2025	9.62764
2030	9.32776
2035	8.9817
2040	8.63644
2045	8.30939
2050	7.98682
2055	7.68872
2060	7.41611
2065	7.14622
2070	6.87308
2075	6.63112
2080	6.41442
2085	6.22546
2090	6.05302
2095	5.89474
2100	5.75268