Year	Percent
1950	5.3526
1955	4.35818
1960	4.07561
1965	4.15948
1970	4.0471
1975	4.19168
1980	2.99406
1985	2.89454
1990	3.14536
1995	3.48834
2000	3.94054
2005	4.29651
2010	5.10431
2015	5.35659
2020	5.57254
2025	5.82546
2030	6.27174
2035	6.81297
2040	6.25199
2045	6.4902
2050	6.71
2055	7.39047
2060	9.11453
2065	10.50107
2070	12.20908
2075	14.03015
2080	15.75731
2085	17.55623
2090	19.41513
2095	21.25958
2100	23.03257