Year	Percent
1950	5.67779
1955	4.31461
1960	3.93483
1965	3.7749
1970	3.73988
1975	3.7142
1980	3.76495
1985	3.8615
1990	4.21921
1995	4.33723
2000	4.4365
2005	4.55043
2010	4.75361
2015	5.19211
2020	5.67087
2025	6.18553
2030	6.75982
2035	7.43687
2040	8.1942
2045	8.94632
2050	9.58369
2055	10.28356
2060	11.20939
2065	12.16341
2070	13.07637
2075	13.87748
2080	14.64182
2085	15.44553
2090	16.29835
2095	17.19342
2100	18.10493