Year Index 2010=1, Trend 1966-01-01 0.137637637023964 1967-01-01 0.151641918970671 1968-01-01 0.158755170900578 1969-01-01 0.167811460138140 1970-01-01 0.183992801496188 1971-01-01 0.206368064108665 1972-01-01 0.222217489507958 1973-01-01 0.228497313098063 1974-01-01 0.282579479215447 1975-01-01 0.329302014373343 1976-01-01 0.342023387012059 1977-01-01 0.383438678313923 1978-01-01 0.426117002280469 1979-01-01 0.430391100630033 1980-01-01 0.491360762663486 1981-01-01 0.525438816705986 1982-01-01 0.566297832207214 1983-01-01 0.614743988950423 1984-01-01 0.641500005649844 1985-01-01 0.676165527144058 1986-01-01 0.696435006959882 1987-01-01 0.727444095951591 1988-01-01 0.752070535398567 1989-01-01 0.797551663491529 1990-01-01 0.779395691290528 1991-01-01 0.774810822805908 1992-01-01 0.786422539969610 1993-01-01 0.785814780324749 1994-01-01 0.767452200196425 1995-01-01 0.752562081640268 1996-01-01 0.756856255510250 1997-01-01 0.784806597280926 1998-01-01 0.812975335928307 1999-01-01 0.795469019252360 2000-01-01 0.771537391338657 2001-01-01 0.779663334288420 2002-01-01 0.800064982911394 2003-01-01 0.807756991679804 2004-01-01 0.819161856208107 2005-01-01 0.838892319349692 2006-01-01 0.843045198254848 2007-01-01 0.870279791549128 2008-01-01 0.971817973965418 2009-01-01 1.053316967733360 2010-01-01 1.000000000000000