The total transaction count (for progress estimation) is counted as the known count at the last checkpoint, plus an estimated number per day.

The last checkpoint is now 996 days ago, and its estimated 60000 transactions per day leads to a total estimate of 96M transactions, while the real number is around 183M.

Fix this by updating the count, timestamp, and rate of transactions... with or without adding a new checkpoint.
#ifndef BITCOIN_CHECKPOINTS_H
#define BITCOIN_CHECKPOINTS_H
#include "uint256.h"
#include <map>
class CBlockIndex;
struct CCheckpointData;
/**
 * Block-chain checkpoints are compiled-in sanity checks.
 * They are updated every release or three.
 */
namespace Checkpoints
{
CBlockIndex* GetLastCheckpoint(const CCheckpointData& data);
} 
#endif