Year	Percent
1950	8.41983
1955	8.20407
1960	7.18902
1965	7.74964
1970	7.00793
1975	7.12283
1980	7.74769
1985	7.69989
1990	7.20675
1995	5.94851
2000	5.07956
2005	4.69748
2010	4.56003
2015	4.44215
2020	4.54728
2025	4.61901
2030	4.28221
2035	4.12726
2040	4.07351
2045	4.1419
2050	4.27795
2055	4.40816
2060	4.47598
2065	4.48103
2070	4.47824
2075	4.5082
2080	4.56234
2085	4.60799
2090	4.62388
2095	4.60449
2100	4.56275