Year	Percent
1950	8.23856
1955	8.17319
1960	9.28118
1965	7.9993
1970	6.10939
1975	6.73856
1980	7.25105
1985	8.24786
1990	6.13202
1995	6.01914
2000	5.83142
2005	4.89511
2010	4.86146
2015	4.93633
2020	4.65044
2025	4.62736
2030	4.60346
2035	4.57771
2040	4.49495
2045	4.4703
2050	4.50566
2055	4.53173
2060	4.56463
2065	4.60639
2070	4.63375
2075	4.64626
2080	4.6591
2085	4.6786
2090	4.69719
2095	4.70434
2100	4.69605