Year	Percent
1950	10.37967
1955	11.06849
1960	11.08179
1965	12.16251
1970	12.13893
1975	12.07691
1980	11.8088
1985	10.57149
1990	9.56216
1995	9.42544
2000	9.58776
2005	8.89341
2010	7.99794
2015	7.29861
2020	6.96029
2025	6.48725
2030	6.20621
2035	5.94502
2040	5.69243
2045	5.45045
2050	5.26173
2055	5.13888
2060	5.04432
2065	4.97691
2070	4.91482
2075	4.86193
2080	4.81404
2085	4.79629
2090	4.7857
2095	4.77923
2100	4.77224