Land Information Minister Mark Mitchell said last week he did not know how often conditions were breached.
Figures released to the Herald under the Official Information Act showed that the OIO was checking up on more investors every year. In 2016, it carried out checks on 419 consent holders.
"The increasing number of monitoring activities reflect increasingly comprehensive conditions of consent," a spokeswoman said.
But the OIO was unable to report how many consent holders had not met all their conditions. The spokeswoman said the OIO was improving its database to allow more accurate reporting.
The OIO was, however, able to report how many times it used its ultimate sanction for investors who had breached their conditions. It had forced investors to dispose of their land ten times between 2006 and 2017.
Meanwhile, the Labour Party alleged today that large amounts of land had been bought by foreigners without the required approval from the OIO.
It released documents which showed the OIO had investigated 115 investors for buying land without approval since 2011.
Just 31 of these investors had been penalised, and the average fine was $8500 - a punishment which Labour leader Andrew Little described as a "slap with a wet bus ticket".
Little claimed the 115 investors had bought 250,000ha of sensitive land. But Mitchell said that estimate was "way off" and the actual amount of land retrospectively approved by the OIO over this period was closer to 1400ha.
Last year, a total of 466,000ha was sold to offshore buyers with OIO approval - a five-fold increase on the previous year.
Mitchell said this did not reflect a "big buy-up" of New Zealand land because some of it was jointly bought by New Zealand investors.