I don't understand the caculations

[shahar]

In the movie:

In the time: 1:20 they report:
Rent is the leading driver of inflation jumping another 5.1% in July compared to last year. Savannah Crosby in San Antonio says she spends 60% of her $40,000 a year salary on rent and says it's gone up seven out of the last eight years.
I can't understand these sentences. Can someone write its an another Easy English version.

 

[blamocur]

I am guessing you have difficulties with the underscored phrase. English is not my first language, but I'll try anyway:
"In the last 8 years there were 7 years in which the rent has gone up and 1 year in which it has not."

I suspect some of the native speakers on this forum will do a much better job than mine