Year	Percent
1950	10.16673
1955	8.63044
1960	8.28124
1965	8.90795
1970	10.60985
1975	10.64853
1980	10.56542
1985	10.83848
1990	10.97879
1995	11.12786
2000	11.22262
2005	10.11373
2010	9.34752
2015	9.47577
2020	9.67265
2025	8.66414
2030	7.77312
2035	7.4932
2040	7.37311
2045	7.26949
2050	7.06499
2055	6.79842
2060	6.52729
2065	6.35715
2070	6.30247
2075	6.2946
2080	6.27203
2085	6.20996
2090	6.13787
2095	6.07929
2100	6.05711