[jmg]

Total number of orders since 2010: 529
Total spent: $17,791.24

You can generate a CSV file that shows you every single order and how much you spent:

Go to your "YOUR ACCOUNT" in the dropdown menu on the upper right on the website.
Then "DOWNLOAD ORDER REPORTS"
Then "ORDERS"
Set the date range to as far back as you need to
Click "DOWNLOAD CSV"
Open it in Excel
SUM the "AW" column
Each row is a separate item so the last row number tells you about how many items you purchased including the returns and cancelled orders.

Note: I didn't bother to subtract the cancelled or returned orders, so it's probably a little less than 529.