Year	Percent
1950	9.42367
1955	8.37496
1960	8.29914
1965	8.85486
1970	8.45374
1975	7.74725
1980	6.32824
1985	5.33269
1990	4.94039
1995	4.76813
2000	4.60284
2005	4.69107
2010	4.68897
2015	4.2916
2020	4.10172
2025	4.02172
2030	4.06451
2035	4.1649
2040	4.25033
2045	4.27288
2050	4.251
2055	4.25225
2060	4.3174
2065	4.42608
2070	4.52466
2075	4.57652
2080	4.57294
2085	4.53515
2090	4.50588
2095	4.49668
2100	4.50478