Year	Percent
1950	6.85481
1955	7.61598
1960	10.05452
1965	9.84477
1970	10.96017
1975	11.90946
1980	10.71694
1985	10.53964
1990	10.55266
1995	9.37202
2000	10.30135
2005	11.0891
2010	10.50073
2015	10.6146
2020	10.45695
2025	9.78139
2030	9.1105
2035	8.76076
2040	8.62358
2045	8.49676
2050	8.29366
2055	7.99437
2060	7.66225
2065	7.37018
2070	7.1521
2075	6.97775
2080	6.78975
2085	6.5734
2090	6.34994
2095	6.15758
2100	5.98762