Year	Percent
1950	12.85519
1955	13.31638
1960	13.92855
1965	13.71493
1970	13.64515
1975	13.77353
1980	14.69106
1985	14.47678
1990	14.29576
1995	14.83379
2000	15.15941
2005	13.39344
2010	11.72736
2015	11.36815
2020	10.60977
2025	9.87559
2030	9.07507
2035	8.34058
2040	7.71235
2045	7.17607
2050	6.7106
2055	6.30435
2060	5.95797
2065	5.67277
2070	5.45857
2075	5.29487
2080	5.1598
2085	5.0484
2090	4.95792
2095	4.88637
2100	4.83314