Year	Percent
1950	11.34748
1955	11.04938
1960	10.93591
1965	11.4433
1970	10.22855
1975	9.81095
1980	8.81656
1985	7.5491
1990	6.09183
1995	5.72627
2000	5.49175
2005	5.5955
2010	4.95082
2015	4.6118
2020	4.1206
2025	3.887
2030	3.95188
2035	4.06219
2040	4.10586
2045	4.04684
2050	3.93399
2055	3.85849
2060	3.90837
2065	4.0472
2070	4.19247
2075	4.26091
2080	4.25152
2085	4.21093
2090	4.20494
2095	4.25856
2100	4.33873