The 2015 and 2017 general elections were the most volatile in modern times
% of voters choosing a different party from the previous election
43%
40%
30
33%
20
10
0
1966
1974
1992
2001
2015
1970
1979
1987
1997
2010
2017
43%
40%
30
33%
20
10
0
1966
1970
1974
1979
1987
1992
1997
2001
2010
2015
2017