pre_text: Our restaurant leases generally provide for fixed rental payments (with cost-of-living index adjustments) plus real estate taxes, insurance, and other expenses. In addition, approximately 14% of our leases provide for contingent rental payments between 1% and 15% of the restaurant’s gross sales once certain thresholds are met. We have generally been able to renew our restaurant leases as they expire at then-current market rates. The remaining terms of ground leases range from less than one year to 49 years, including optional renewal periods. The remaining lease terms of our other leases range from less thanone year to 56 years, including optional renewal periods. As of September 29, 2019, our restaurant leases had initial terms expiring as follows: Our principal executive offices are located in San Diego, California in an owned facility of approximately 150,000 square feet. We also own our 70,000 square foot Innovation Center and approximately four acres of undeveloped land directly adjacent to it. We plan to sell our principal executive offices and consolidate our headquarters in the Innovation Center, which we believe will be suitable and adequate for our purposes.
table: Number of Restaurants
table: Land and
table: Ground Building
table: Fiscal Year Leases Leases
table: 2020 – 2024 381 697
table: 2025 – 2029 198 270
table: 2030 – 2034 40 135
question: Analyse this data from a financial earnings document. What is the difference of ground leases expiring between the periods 2020 - 2024 and 2025 - 2029?