mutual and pooled funds shares of mutual funds are valued at the net asset value ( nav ) quoted on the exchange where the fund is traded and are classified as level 1 assets . units of pooled funds are valued at the per unit nav determined by the fund manager and are classified as level 2 assets . the investments are utilizing nav as a practical expedient for fair value . corporate and government bonds corporate and government bonds are classified as level 2 assets , as they are either valued at quoted market prices from observable pricing sources at the reporting date or valued based upon comparable securities with similar yields and credit ratings . mortgage and asset-backed securities mortgage and asset 2013backed securities are classified as level 2 assets , as they are either valued at quoted market prices from observable pricing sources at the reporting date or valued based upon comparable securities with similar yields , credit ratings , and purpose of the underlying loan . real estate pooled funds real estate pooled funds are classified as level 3 assets , as they are carried at the estimated fair value of the underlying properties . estimated fair value is calculated utilizing a combination of key inputs , such as revenue and expense growth rates , terminal capitalization rates , and discount rates . these key inputs are consistent with practices prevailing within the real estate investment management industry . other pooled funds other pooled funds classified as level 2 assets are valued at the nav of the shares held at year end , which is based on the fair value of the underlying investments . securities and interests classified as level 3 are carried at the estimated fair value of the underlying investments . the underlying investments are valued based on bids from brokers or other third-party vendor sources that utilize expected cash flow streams and other uncorroborated data , including counterparty credit quality , default risk , discount rates , and the overall capital market liquidity . insurance contracts insurance contracts are classified as level 3 assets , as they are carried at contract value , which approximates the estimated fair value . the estimated fair value is based on the fair value of the underlying investment of the insurance company . contributions and projected benefit payments pension contributions to funded plans and benefit payments for unfunded plans for fiscal year 2015 were $ 137.5 . contributions resulted primarily from an assessment of long-term funding requirements of the plans and tax planning . benefit payments to unfunded plans were due primarily to the timing of retirements and cost reduction actions . we anticipate contributing $ 100 to $ 120 to the defined benefit pension plans in 2016 . these contributions are driven primarily by benefit payments for unfunded plans , which are dependent upon timing of retirements and actions to reorganize the business . projected benefit payments , which reflect expected future service , are as follows: .
considering the average for the years 2021-2025 , what is the increase observed in the projected benefit payments for the u.s during 2020 and 2021?
these estimated benefit payments are based on assumptions about future events . actual benefit payments may vary significantly from these estimates. .