Year	Percent
1950	5.1774
1955	5.22229
1960	5.26202
1965	5.46379
1970	5.67793
1975	5.28965
1980	4.76886
1985	4.56193
1990	4.80822
1995	4.76588
2000	4.58074
2005	4.39457
2010	4.34096
2015	4.64912
2020	5.01134
2025	5.40334
2030	5.85884
2035	6.40845
2040	7.03785
2045	7.6984
2050	8.45986
2055	9.42551
2060	10.60734
2065	11.78988
2070	12.93993
2075	14.0651
2080	15.28666
2085	16.58678
2090	17.91848
2095	19.23852
2100	20.56406