Year	Percent
1950	8.68692
1955	8.46477
1960	7.49704
1965	8.08982
1970	7.31205
1975	7.42954
1980	8.11907
1985	8.06717
1990	7.56181
1995	6.25434
2000	5.36373
2005	4.96098
2010	4.82252
2015	4.6862
2020	4.77728
2025	4.84841
2030	4.48961
2035	4.32093
2040	4.26091
2045	4.32968
2050	4.46925
2055	4.60152
2060	4.66596
2065	4.66205
2070	4.64914
2075	4.67144
2080	4.72193
2085	4.76644
2090	4.78197
2095	4.76106
2100	4.71674