Confused by a sentence from an article
I read an article about Australian properties, and there are some words which are very hard for me to understand. Here is the excerpt:
"Total property listings across the capitals have risen 10.2%, leaving them at the highest level since late 2012."
"By individual capital, listings in Sydney and Melbourne have surged by 19.5% and 18.4% over the past 12 months, largely explaining the increase in the national measure."
What does the "property listings" mean?
What does the "by individual capital" mean? I know "individual capital" means something like talent after consulting the internet, but I feel it doesn't make sense in this sentence if it means that.
The last one confusing me is "in the national measure". Does it mean "at the national level"?
I will really appreciate if someone can explain these to me. Thanks.