See the analysis from Reuters here:
Global investment banking-related activities generated an estimated US$102.6 billion in fees during full year 2018, a 4% decline compared to full year 2017.
The Americas led all other regions by fees, contributing half of the global pool with US$51.2 billion.
Imputed fees in the EMEA region reached US$25.9 billion, posting a 3% downtick compared to the previous year.
IB fees in the Asia-Pacific region totaled US$19.6 billion during full year 2018, registering a 10% decline compared to a year ago driven by tepid activity in China.
Estimated fees in Japan hit a record US$5.9 billion, increasing 9% year-over-year compared to 2017.