Year	Percent
1950	13.65412
1955	12.67908
1960	9.58759
1965	9.56639
1970	11.95926
1975	12.68688
1980	12.76699
1985	12.19751
1990	12.0982
1995	14.31152
2000	14.87496
2005	12.05196
2010	8.48013
2015	6.54297
2020	6.76038
2025	7.56716
2030	7.16617
2035	6.15613
2040	5.12523
2045	4.60293
2050	4.62377
2055	4.8186
2060	4.80192
2065	4.52175
2070	4.20512
2075	4.06898
2080	4.17287
2085	4.37321
2090	4.49051
2095	4.44166
2100	4.30922