Year	Percent
1950	8.14534
1955	10.66268
1960	11.74839
1965	11.34611
1970	8.54863
1975	7.45635
1980	7.9015
1985	8.71395
1990	8.88792
1995	7.62753
2000	6.62783
2005	5.32223
2010	4.67885
2015	5.23323
2020	5.00537
2025	4.58365
2030	4.20302
2035	3.97276
2040	3.86967
2045	3.97129
2050	4.11322
2055	4.12512
2060	4.02721
2065	3.95586
2070	3.97493
2075	4.10284
2080	4.27505
2085	4.39193
2090	4.41581
2095	4.37973
2100	4.36448