Graphs At A Glance: How many people actually voted FOR the ruling party in recent general elections?

How much support should a cause have? From Unions wanting strikes for more pay to governments wanting the power to wield the bountiful ladle of taxing and spending?

Since 1979 no ruling party has ever had the votes of more than 1 in 3 of those registered to vote in a British General Election, (i.e. not including those who didn't register to vote, but including those registered voters who didn't vote).

Updated to include 2015 result

Since 2001 no ruling party has ever had the votes of more than 1 in 4 registered voters in a British General Election.