In the past 40 years, polio cases have plummeted in developing countries. Currently, only two polio-endemic countries remain: Afghanistan and Pakistan.
Increases in China after 1997 represent cases imported from other countries
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Year China India Pakistan Egypt
1980 52094 132825 20860 14042 1981 67375 266630 30338 11291 1982 54187 184079 24542 15071 1983 23072 172641 6307 7133 1984 11382 161749 4165 5040 1985 10759 157990 15113 3948 1986 12908 141050 4501 2912 1987 6783 197848 8498 4403 1988 4669 166600 6545 3850 1989 5132 97450 5677 3318 1990 5622 72856 5439 3955 1991 2138 41272 8029 4375 1992 1322 65765 7322 4088 1993 4571 29659 12621 1050 1994 261 33537 3689 840 1995 165 22841 3556 497 1996 3 7035 2387 700 1997 0 15925 8029 98 1998 0 30254 2387 245 1999 1 19719 3906 63 2000 0 294 398 8 2001 0 536 132 10 2002 0 3200 100 8 2003 0 450 114 1 2004 2 149 59 1 2005 0 73 31 0 2006 0 750 44 0 2007 0 970 36 0 2008 0 620 130 0 2009 0 846 99 0 2010 0 48 160 0 2011 21 1 220 0 2012 0 0 82 0 2013 0 0 157 0 2014 0 0 364 0 2015 0 0 62 0 2016 0 0 23 0