Year	Percent
1950	8.69203
1955	8.98185
1960	8.78922
1965	9.45232
1970	9.56585
1975	9.06963
1980	8.79552
1985	8.22141
1990	6.48088
1995	5.31772
2000	4.81205
2005	4.52312
2010	4.9035
2015	5.29652
2020	4.68706
2025	4.30445
2030	3.99251
2035	3.88348
2040	3.97532
2045	4.16025
2050	4.28979
2055	4.2711
2060	4.19175
2065	4.16862
2070	4.23535
2075	4.36286
2080	4.48025
2085	4.51868
2090	4.47826
2095	4.40488
2100	4.36359