Year	Percent
1950	8.86563
1955	7.01609
1960	9.21004
1965	10.51405
1970	10.31744
1975	7.8076
1980	6.80209
1985	7.32814
1990	8.06509
1995	8.31091
2000	7.20074
2005	6.26287
2010	4.99786
2015	4.40577
2020	4.96202
2025	4.77375
2030	4.39214
2035	4.04636
2040	3.8422
2045	3.76127
2050	3.88027
2055	4.03748
2060	4.06565
2065	3.98745
2070	3.93506
2075	3.96883
2080	4.10301
2085	4.27213
2090	4.37901
2095	4.39204
2100	4.34816