Most runs in ICC Tournaments in each Decade 

1970s - Glenn Turner (509)
1980s - Viv Richards (758)
1990s - Sachin Tendulkar (1208)
2000s - Sanath Jayasuriya (1633)
2010s - Virat Kohli (2241)
2020s - Virat Kohli (1400)*

Virat Kohli dominated ICC tournaments for 02 decades 🐐.