Year,Impact Factor papers (IFP),Total Impact Factor (TIF)|1966,3,1.861|1967,4,5.188|1968,6,7.396|1969,6,5.038|1970,13,17.195|1971,10,8.584|1972,36,21.644|1973,30,12.905|1974,32,11.767|1975,40,15.481|1976,39,13.253|1977,36,7.051|1978,65,16.161|1979,61,22.831|1980,58,21.624|1981,66,24.633|1982,37,25.229|1983,37,19.419|1984,50,26.930|1985,30,15.430|1986,66,46.189|1987,62,42.882|1988,94,81.488|1989,80,88.993|1990,88,117.676|1991,90,170.778|1992,79,95.147|1993,107,119.084|1994,89,94.648|1995,76,67.586|1996,87,111.234|1997,67,70.014|1998,69,95.410|1999,86,96.239|2000,83,109.027|2001,75,99.312|2002,75,108.011|2003,71,87.214|2004,67,89.390|2005,127,179.048|2006,152,195.495|2007,113,155.481|2008,142,261.420|2009,136,274.073|2010,168,273.512|2011,186,342.331|2012,170,382.079|2013,179,408.333|2014,187,397.819|2015,170,394.187|2016,157,374.988|2017,199,476.556|2018,194,496.314|2019,187,452.430|2020,219,618.904|2021,217,745.849|2022,190,704.611|2023,193,836.813