Understanding Society User Support

Hi- apologies for bothering you, but I am currently researching couple finances and have found the variables wealthassetsanddebt_ip3.svacsj (relating to savings) and wealth assetsanddebt_ip3.nvestsj (relating to investments) on this page: https://www.understandingsociety.ac.uk/documentation/innovation-panel/dataset-documentation/wave/3/questionnaire-module/wealthassetsanddebt_ip3. Firstly, I just wanted to check that these are the only questions on the survey that dealt with jointly/ solely held assets within couples? Secondly, I looked at the results for e.g. the first variable (https://www.understandingsociety.ac.uk/documentation/innovation-panel/dataset-documentation/wave/3/datafile/c_indresp_ip/variable/c_svacsj- although the same is also applicable for the results for the second variable, which can be found at https://www.understandingsociety.ac.uk/documentation/innovation-panel/dataset-documentation/wave/3/datafile/c_indresp_ip/variable/c_nvestsj) and was wondering, what are the ‘proxy’ results (apologies if that is an ignorant question)? If I were to wish to calculate each possible arrangement (i.e. sole, joint and both) as a percentage of all of the valid responses, not including where the question was inapplicable, would I just include sole, joint, and sole and joint, or do the ‘proxies’ need to be factored in as well? Thirdly, is this the most up-to-date data that you have on sole/joint savings and investments (am I right in thinking that it dates back to 2013)? Thanks so much