They come from the Google Keyword Tool. The data may have changed or have been updated.
There are currently over 32 zips - total of 320 spreadsheets and growing as I add 40 new ones every 2 weeks.
The keyword spreadsheets are constantly updated with the newest ones at the top. I am adding new ones every 2 weeks so there is no need to REDO any old ones - they all have value - regardless of the date - and if you only want to use the most recent ones - do that - but most users folowing the 12 step system will benefit from using all of the spreadsheets - even the oldest ones! Maybe even especially the oldest ones!
If you need current accurate data - youshould get that from the tool directly.
The spreadsheets work like magic.

Really! I hear it all the time from people. They do what they are supposed to do. They are not intended to ALL be accurate up to the minute. If you need that - that's where the GKT comes in
I do not use the "new" Google keyword tool. It is still in beta and the old tool does exactly what we need.
First off - the volume and bid numbers themselves from Google are estimations so I doubt they are accurate to begin with.
I just looked up party supplies and it shows 823,000 volume for "exact match". I don't know which spreadsheet you were looking at. I'm sure that keyword is in several of them - some older - some newer.
That is another reason why I think that SOFTWARE CAN'T PREDICT PROFITABILITY. You need to eyeball the data a put it through tests and use your brain to make judgements based on several factors that can't be measured entirely by numbers alone.The spreadsheets provided to members are just fine the way they are. They have fantastic keyword opportunities in them. How accurate the data is - should not impact the way you use them to find keyword targets.
The dates of the data are in the file name date.
Use only NEW files if you NEED the newest data - BUT - for waht I use the spreadsheets for and train BU people to do - the date of the data does not matter - there are keyword opportunities in ONE YEAR OLD spreadsheets.
That is why I suggest in the training going to the Google Keyword Tool to verify and look at the updated info to make surebids are still good and volume is still there.
Also keep in mind from month to month data flcutuates - Halloween is not a year round search topic so it goes up and down. Unless you have data from October (it's September now) it's not accurate anyways.
That said - I have never personally noticed a difference - however I must admit that is not something I look for.