看sp500 5%幅度的回调（时间-幅度），自2005年以来，每年都有
2005-01-03 1202 - 14 -3.3
2005-03-07 1225 - 31 -7.4
2005-08-03 1245 - 50 -5.6
2006-05-09 1325 - 24 -7.9
2007-02-20 1459 - 9 -5.9
2007-07-19 1553 - 19 -9.7
2007-10-09 1565 - 33-10.3
2007-12-10 1515 - 28-14.3
2008-02-01 1395 - 25 -9.0
2008-05-19 1426 - 39-15.8
2008-08-11 1305 - 26-11.7
2008-09-19 1255 - 6-12.1
2008-09-30 1166 - 8-25.3
2008-10-13 1003 - 2 -9.6
2008-10-20 985.0 - 5-14.6
2008-11-04 1005 - 6-16.0
2008-11-13 911.0 - 5-18.6
2008-11-28 896.0 - 1 -8.9
2008-12-16 913.0 - 5 -5.6
2009-01-06 934.0 - 9-14.6
2009-01-28 874.0 - 2 -5.7
2009-02-09 869.0 - 19-24.4
2009-03-26 832.0 - 2 -5.5
2009-05-08 929.0 - 5 -5.1
2009-06-12 946.0 - 17 -7.2
2009-10-19 1097 - 9 -5.6
2010-01-19 1150 - 14 -8.4
2010-04-23 1217 - 10 -9.0
2010-05-12 1171 - 17-10.6
2010-06-18 1117 - 10 -8.8
2010-08-09 1127 - 13 -7.3
2011-02-18 1343 - 17 -6.6
2011-04-29 1363 - 32 -7.3
2011-07-07 1353 - 22-18.5
2011-08-15 1204 - 4 -6.8
2011-08-31 1218 - 6 -5.3
2011-09-16 1216 - 11 -9.9
2011-10-28 1285 - 19-10.1
2012-04-02 1419 - 42-10.3
2012-09-14 1465 - 42 -7.8
2013-05-21 1669 - 23 -5.8
2014-01-15 1848 - 12 -5.9
2014-09-18 2011 - 19 -7.6
2014-12-05 2075 - 7 -5.1
2015-07-20 2128 - 26-12.9
2015-09-16 1995 - 8 -5.8
2015-11-03 2109 - 68-13.8
2016-06-08 2119 - 13 -5.7
看sp500 10%幅度的回调（时间-幅度），自2005年以来，2006，2013，2014，2016没有
2005-01-03 1202 - 74 -5.4
2007-10-09 1565 - 104-19.7
2008-05-19 1426 - 101-43.7
2008-10-13 1003 - 10-15.8
2008-11-04 1005 - 12-27.7
2009-01-06 934.0 - 42-31.0
2010-04-23 1217 - 49-16.7
2011-04-29 1363 - 108-19.9
2011-10-28 1285 - 19-10.1
2012-04-02 1419 - 42-10.3
2015-07-20 2128 - 26-12.9
2015-11-03 2109 - 68-13.8
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