While there had been legislatures with more than two chambers (tricameral and tetracameral ones), nowadays there are only unicameral and bicameral ones. Additionally, there are also differences in the degree of bicameralism. Whereas Italy is considered as having "perfect bicameralism", with both chambers being equal, most other bicameral systems restrict the upper house's powers to a certain extent. There is a slight trend towards unicameralism; some upper houses have seen their powers reduced or proposals to that end. Belgium's system has been reduced from a perfectly bicameral one to a nowadays "de facto" unicameral system. In 2009, Romania voted in favour of unicameralism, on a plebiscite, however the country still has a bicameral system, as of . On the other hand, Ireland narrowly voted against abolishing their upper house in 2013, and Italy voted not to reduce its Senate's powers in 2016.