Year	Percent
1950	9.98197
1955	10.23251
1960	10.64095
1965	9.50614
1970	10.70498
1975	11.12727
1980	10.54613
1985	10.02992
1990	9.2688
1995	9.10332
2000	8.23321
2005	8.03979
2010	7.95253
2015	7.49658
2020	6.84409
2025	6.2991
2030	5.52034
2035	5.26624
2040	5.09827
2045	4.99867
2050	4.85057
2055	4.66754
2060	4.51081
2065	4.42196
2070	4.41642
2075	4.44489
2080	4.46352
2085	4.45915
2090	4.45031
2095	4.45532
2100	4.49599