Year	Percent
1950	10.50568
1955	10.99073
1960	11.96526
1965	11.91328
1970	12.52911
1975	11.93324
1980	11.52691
1985	10.63226
1990	10.73895
1995	10.43674
2000	9.21711
2005	8.38111
2010	8.03673
2015	8.20033
2020	8.17434
2025	7.43013
2030	6.86823
2035	6.38273
2040	6.13238
2045	6.09203
2050	6.03296
2055	5.79628
2060	5.47657
2065	5.21578
2070	5.09033
2075	5.07127
2080	5.08214
2085	5.01095
2090	4.87147
2095	4.73691
2100	4.67903