Year	Percent
1950	8.12187
1955	8.56403
1960	10.30306
1965	9.02022
1970	8.82477
1975	9.04005
1980	8.62978
1985	7.29123
1990	6.02822
1995	5.84986
2000	6.11009
2005	6.14871
2010	5.93182
2015	5.97095
2020	5.45769
2025	5.14532
2030	5.18116
2035	5.24615
2040	5.24265
2045	5.1775
2050	5.06836
2055	4.97893
2060	4.98048
2065	5.04805
2070	5.08087
2075	5.05418
2080	4.98293
2085	4.91556
2090	4.88746
2095	4.89734
2100	4.90708