I keep records (in a Filofax, natch!) of all the letters, cards etc. that I write and receive. I also keep track of all the new penpals I have each month, from march. So now, for your edification and mine, here is the list:

January: wrote 35, received 46.
February: wrote 24, received 38.
March: wrote 56, received 49, had 97 penpals.
April: wrote 45, received 41, had 101 penpals.
May: wrote 62, received 30, had 106 penpals.
June: wrote 55, received 40, had 112 penpals.
July: wrote 108, received 79, had 125 penpals.
August: wrote 83, received 94, had 145 penpals.
September: wrote 92, received 95, had 164 penpals.
October: wrote 92, received 78, had 172 penpals.
November: wrote 132, received 108, had 186 penpals.
December: wrote 133, received 160, had 192 penpals.

TOTAL: I wrote 917 and received 858, and gained 95 penpals in 2015!!!

Not bad, eh? So, can I write 1000 letters this year? Piece of cake!