The musicians’ walkout in March and April of this year was the key factor in the increase in the CSO’s deficit from $900,000 in 2017-18 to $1.1 million in 2018-19. On the other hand, operating expenses fell by $3.5 million (also due largely to the strike), contributions went up by $1.3 million, and the endowment grew by 3.6% to $314 million. – Chicago Tribune