Picture :  they are the Football Kings, not only for hat-tricks, of the last 15 years !

“Kings of Hat-Tricks” in XXI century year-wise 

Here we publish the list of players to score most hat-tricks for each year of the current century separately. All top-level games worldwide are taken in consideration. 
Two players won the title “king of hat-tricks” more than once: of course, Lionel Messi (4 times, in 2010, 2012, 2014 and 2018) and Cristiano Ronaldo (3 times, in 2011, 2015 and 2016).
In the cases of equal number of hat-tricks overall, the following tie-breakers are used: 1) hat-tricks in international games (ICC+NT), 2) in national team (NT), 3) in national league (NL), 4) number of total goals scored in the hat-trick games, 5) strength of the league (according IFFHS league ranking).
The right columns indicate the “size” of hat-tricks: number of games with 3, 4, 5 and 6 goals. 

YearPlayerCountryClubHT   TotalGoals   
    NLNCICCNT 3456
2001José Alfredo CastilloBoliviaOriente Petrolero6   651  
2002Arman Karamyan ArmeniaPyunik81  971 1
2003Ara Hakobyan ArmeniaBanants 9   9711 
2004Vjatšeslav Zahovaiko EstoniaFlora6   651  
2005Tarmo NeemeloEstoniaTVMK6   642  
2006Humberto SuazoChileColo-Colo1 2 33   
2007Aleksandar ĐurićSingaporeSingapore Armed Forces 5   541  
2008RicoBrazilMuharraq (Bahrain)213 6411 
2009Luis Suárez UruguayAjax (Netherlands)311 522 1
2010Lionel MessiArgentinaBarcelona (Spain)411 651  
2011Cristiano RonaldoPortugalReal Madrid (Spain)9   981  
2012Lionel MessiArgentinaBarcelona (Spain)6 129621 
2013Ali AshfaqMaldivesNew Radiant5 2294221
2014Lionel MessiArgentinaBarcelona (Spain)4 1 55   
2015Cristiano RonaldoPortugalReal Madrid (Spain)5 218512 
2016Cristiano RonaldoPortugalReal Madrid (Spain)4 21752  
2017Harry KaneEnglandTottenham611 871  
2018Lionel MessiArgentinaBarcelona (Spain)3 1155   
2019Abderrazak HamdallahMoroccoAl Nassr (Saudi Arabia)44  853  
2020Ramiro Rocca ArgentinaMunicipal (Guatemala)4   422  
2021Ali MabkhoutUAEAl-Jazira3  255   
2022Kylian MbappéFrancePSG31 155