Year	Percent
1950	10.1804
1955	9.99505
1960	9.75499
1965	9.93138
1970	10.78898
1975	10.6451
1980	10.52983
1985	10.50217
1990	10.70069
1995	10.84155
2000	10.61925
2005	10.05036
2010	9.93857
2015	10.27121
2020	10.14026
2025	9.8689
2030	9.4386
2035	9.15896
2040	8.94702
2045	8.7414
2050	8.52409
2055	8.28281
2060	8.04243
2065	7.8052
2070	7.60233
2075	7.40991
2080	7.21871
2085	7.03233
2090	6.8386
2095	6.65687
2100	6.48411