That is because bc.i has been blocking transactions with low tx fees or with lots of outputs.

Meanwhile, here is what you can see on some other block explorers and monitors:
https://www.blocktrail.com/BTC/: 65k unconfirmed transactions, 112 MB mempool
https://tradeblock.com/bitcoin/:  89k unconfirmed transactions, 104 MB mempool
https://bitcoinfees.github.io/: 124 MB mempool size
http://statoshi.info/dashboard/db/transactions/: 137k unconfirmed transactions
http://munin.bitcoin-fr.io/bitcoin-fr.io/n.bitcoin-fr.io/index.html: 134k unconfirmed transactions, 116 MB mempool