Year	Percent
1950	7.78
1955	7.97904
1960	10.46667
1965	9.15298
1970	8.2686
1975	7.74121
1980	6.95314
1985	5.8383
1990	6.19463
1995	6.15389
2000	5.84912
2005	6.03748
2010	5.32547
2015	5.12254
2020	5.37156
2025	5.25492
2030	5.30605
2035	5.27839
2040	5.18468
2045	5.11613
2050	5.12907
2055	5.17847
2060	5.19583
2065	5.16358
2070	5.10459
2075	5.03927
2080	5.00205
2085	4.98522
2090	4.97036
2095	4.94184
2100	4.89036