1990s: Christian Vieri (1999)

Former Italian striker Christian Vieri joins the list as he completed his move from Lazio to Inter Milan for a massive £32 million in 1999. The attacker flourished at the San Siro where he scored 103 times in his 144 appearances for the Nerazzurri where he had formed a dangerous partnership with Ronaldo Nazario upfront.
2000s: Cristiano Ronaldo (2009)

Cristiano Ronaldo’s big money move of £80 million from Manchester United to Real Madrid in 2009 defined an era of trophies and massive European success at the club. He was instrumental in helping the club lift 4 Champions League titles during his stay in Madrid. He had an unmatched scoring records for the Los Blancos as he has 450 goals and 131 assists in his 438 appearances at the club.
2010s: Neymar (2017)

While this period is yet to be over, there have been several big money moves and the biggest one is help by Neymar whose move from FC Barcelona to Paris-Saint Germain costed the French club a massive £198 million in 2017. Even after such a big money move, there have been reports of the Brazilian being unhappy and there are chances that he might be seeking for a move away from Paris this summer.