Year	Percent
1950	4.27444
1955	3.90075
1960	3.31543
1965	2.61575
1970	2.84922
1975	2.73538
1980	2.26726
1985	2.16366
1990	2.22946
1995	2.4939
2000	2.97219
2005	3.60354
2010	3.42372
2015	4.07171
2020	6.14303
2025	8.45252
2030	12.05557
2035	15.65305
2040	18.17167
2045	19.85942
2050	20.51749
2055	20.95647
2060	21.99914
2065	22.62855
2070	23.51821
2075	24.73385
2080	26.05456
2085	26.98553
2090	27.70835
2095	28.4171
2100	29.17881