Following Barry's post I did some quick stats on my own garden. I don't have 16 years of data but thought it would be interesting to see how the curve compared, and it is quite remarkable how closely they two correlate. I then thought I'd throw in a garden with a considerably longer series - Jakes.
Jake's list takes a few years to get going as it included the odd butterfly record a few years before he started regularly trapping. The diversity may be lower in the urban garden, but the trend looks pretty much the same to me. I'm more impressed that my garden is pretty much keeping pace with Barry's though, in spite of his proximity to Gower and the fact that I simply don't get migrants!