Year Number of strikes Number of workers involved Working hours not worked, thousands
1991 3 24,148 76.0
1992 4 1,010 33.0
1993 5 2,574 42.0
1994 4 31,529 229.0
1995a 7 172,048 1,708.0
1996 8 4,491 19.0
1997 5 853 15.0
1998 7 1,447 3.0
1999 5 16,685 242.0
2000 5 26,978 1,192.0
2001 6 21,128 61.0
2002 4 4,573 9.0
2003 7 10,831 19.0
2004 8 6,276 116.0
2005 11 1,425 7.0
2006 16 24,665 52.0
2007 13 64,612 186.0
2008 8 8,633 ..
2009 9 3,134 8.6
2010 7 3,263 133.1
2011 1
2012 3 1,885 4.6
2013 1
2014
2015 2
2016b 7 39,101 270.5
2017 5 6,706 30.4
2018b 6 15,535 289.4
2019b 12 20,905 416.3
2020 2
2021 4 2,357 19.3
2022c 4 38,959 271.2
2023 3 17,779 91.1

Footnotes

*Source: Strikes statistics.
aEstimated data with pedagogue strikes.
bThe data include professional estimates too.
cThe annual strike statistical data is aggregated per strike event, therefore the number of workers participating in several strike events is also summarized.
.