Last night in Sweden

[Aimless]

And it it really healthy for any country to have a party in power for most of the last 100 years ?

I don't know, probably not. But it's important to note that this hasn't really been the case; three-quarters of all Swedish governments have been minority governments that have had to govern by compromising w/ parties on both sides of the political spectrum. In practice, Sweden has not often been governed exclusively or even primarily by a single party or coalition.