Favorite single released in each year?

Out of all the singles that were released in each year, which one of those is your favorite?



2006: Skirt, Hirari

2007: Keibetsu Shiteita Aijou

2008: Oogoe Diamond

2009: Namida Surprise

2010: Heavy Rotation

2011: Flying Get

2012: Give Me Five



You can include SKE if you want to, or sub-groups.