Year	Percent
1950	9.14249
1955	8.52804
1960	8.46289
1965	8.78889
1970	8.96252
1975	8.74908
1980	8.22892
1985	8.1171
1990	8.57299
1995	9.50492
2000	8.78621
2005	8.61454
2010	8.40374
2015	7.91822
2020	7.86635
2025	7.65953
2030	7.52107
2035	7.24209
2040	6.9609
2045	6.71575
2050	6.49497
2055	6.29848
2060	6.12044
2065	5.95726
2070	5.7975
2075	5.65484
2080	5.54122
2085	5.44086
2090	5.36055
2095	5.28354
2100	5.20796