Year	Percent
1950	11.82265
1955	10.65986
1960	11.53818
1965	12.18699
1970	14.74677
1975	14.70359
1980	13.91062
1985	12.06376
1990	12.56754
1995	10.55679
2000	9.14962
2005	9.02086
2010	7.21885
2015	7.10332
2020	7.25712
2025	7.07686
2030	6.26203
2035	5.81777
2040	5.69426
2045	5.68804
2050	5.7301
2055	5.6909
2060	5.54818
2065	5.39361
2070	5.31795
2075	5.31159
2080	5.31999
2085	5.29354
2090	5.2252
2095	5.14288
2100	5.08532