US Share of Wages to Itemizers

Year	Total Wages	Itemizer Wages	Itemizer share
1960	257.39	140.33	0.55
1961	279.82	159.12	0.57
1962	316.02	187.30	0.59
1963	334.45	198.48	0.59
1964	359.46	213.23	0.59
1965	417.20	249.07	0.60
1966	425.95	256.44	0.60
1967	457.02	285.88	0.63
1968	497.15	321.88	0.65
1969	547.20	372.17	0.68
1970	577.55	402.31	0.70
1971	611.52	389.24	0.64
1972	673.24	379.68	0.56
1973	743.34	424.50	0.57
1974	819.25	485.37	0.59
1975	848.21	468.32	0.55
1976	942.51	513.79	0.55
1977	1034.63	525.55	0.51
1978	1164.70	629.08	0.54
1979	1302.61	698.77	0.54
1980	1413.26	806.19	0.57
1981	1530.41	906.92	0.59
1982	1603.97	993.96	0.62
1983	1696.27	1091.37	0.64
1984	1863.51	1249.13	0.67
1985	1992.39	1355.16	0.68
1986	2108.81	1435.93	0.68
1987	2293.64	1488.63	0.65
1988	2520.84	1517.40	0.60
1989	2647.73	1577.89	0.60
1990	2810.36	1670.78	0.59
1991	2878.92	1683.05	0.58
1992	3047.83	1796.09	0.59
1993	3136.35	1847.04	0.59
1994	3301.84	1932.30	0.59
1995	3489.08	2062.54	0.59
1996	3693.89	2263.14	0.61
1997	3963.72	2456.09	0.62
1998	4263.58	2673.92	0.63
1999	4554.10	2929.97	0.64
2000	4873.42	3202.47	0.66
2001	5002.73	3327.61	0.67
2002	4916.63	3261.08	0.66
2003	5135.32	3346.17	0.65
2004	5483.48	3658.90	0.67
2005	5811.71	3957.34	0.68
2006	6157.13	4216.02	0.68
2007	6370.47	4350.01	0.68
2008	6466.21	4318.77	0.67
2009	6285.90	4091.70	0.65

Wages include self-employment, pensions, partnerships and employer share of FICA. The last column shows the share of itemizers in wages. e.g. in 2009 65.% of wages went to taxpayers who itemized personal deductions on their 1040 form. Data after 2006 are inflated from 2006 data.

Source: http://www.nber.org/taxsim/barro-redlick/