Year	Percent
1950	9.83875
1955	10.01671
1960	10.23482
1965	10.16372
1970	10.09124
1975	10.07783
1980	10.2156
1985	10.41536
1990	10.77534
1995	11.27598
2000	11.41045
2005	11.13024
2010	10.44961
2015	10.29408
2020	10.75527
2025	10.95232
2030	10.64238
2035	10.22567
2040	9.93336
2045	9.78065
2050	9.63482
2055	9.44257
2060	9.20942
2065	8.95572
2070	8.74407
2075	8.54483
2080	8.37575
2085	8.19203
2090	7.99964
2095	7.81586
2100	7.64017