Year	Percent
1950	10.62686
1955	9.12961
1960	8.321
1965	12.41884
1970	12.35116
1975	11.67927
1980	10.98278
1985	11.36509
1990	9.9175
1995	9.57563
2000	9.71789
2005	9.33158
2010	9.14599
2015	8.12254
2020	7.07281
2025	7.14037
2030	6.75093
2035	6.28702
2040	5.86022
2045	5.51957
2050	5.28653
2055	5.19709
2060	5.16999
2065	5.09148
2070	4.98408
2075	4.88438
2080	4.83354
2085	4.82819
2090	4.84705
2095	4.83948
2100	4.80428