I published some Christchurch public transport patronage data previously here.
Here is the latest data, up to the end of July.
And here it is again but zoomed in a bit.
The twelve months to July 2019 had an average of 1.14m passengers. This is down very slightly, around 0.1%, from the twelve months to June 2019.
The month of July 2019 was 1.7% lower than July 2018, as shown below.
So overall, not the greatest patronage numbers in the world, but not really surprising either.