pre_text: On a worldwide basis, the Company's defined benefit pension plans were 88% funded as of January 31, 2019. As of January 31, 2019, the aggregate accumulated benefit obligation was $85.1 million for the defined benefit pension plans compared to $139.5 million as of January 31, 2018. Included in the aggregate data in the following tables are the amounts applicable to the Company's defined benefit pension plans, with accumulated benefit obligations in excess of plan assets, as well as plans with projected benefit obligations in excess of plan assets. Amounts related to such plans at the end of each period were as follows: because their exercise prices are higher than the average market value of Autodesk’s stock during the fiscal year.
table: Fiscal Year Ended January 31,
table: 2019 2018
table: Plans with accumulated benefit obligations in excess of plan assets:
table: Accumulated benefit obligations $75.6 $130.7
table: Plan assets 70.0 112.1
table: Plans with projected benefit obligations in excess of plan assets:
table: Projected benefit obligations $91.6 $158.1
table: Plan assets 80.8 121.1
question: Analyse this data from a financial earnings document. What was the change in the aggregate accumulated benefit obligation from 2018 to 2019?