Year	Percent
1950	8.33353
1955	9.08239
1960	7.69316
1965	5.86513
1970	6.49165
1975	6.9649
1980	7.68837
1985	5.74235
1990	5.56181
1995	5.39831
2000	4.48025
2005	4.37223
2010	4.50755
2015	4.22984
2020	4.20521
2025	4.17928
2030	4.14944
2035	4.07367
2040	4.06024
2045	4.10821
2050	4.14706
2055	4.18634
2060	4.23256
2065	4.27295
2070	4.31062
2075	4.35228
2080	4.39649
2085	4.43451
2090	4.45908
2095	4.46469
2100	4.45912