You can download the decade cards here.
WHAT IS A DECADE CARD
All players build their park and at the end of the decade each collect money based on the value of the park itself and on the available decade bonus. Decade cards are a way to introduce in the game dynamics the aspect of trends: everybody is in love with the Frontier, then it’s all about space explorations, than it’s all about landscaped escapism, and so on. Each decade change the way some attractions will give (or take) money from you at the end of the decade, so players should take them into account when deciding what to build in their park.
HOW TO USE DECADE CARDS
Decade cards must be placed at the center of the table, where all players can see them. On each decade card 5 even cards must be placed. This means each decade is made of 5 events. Each event card will define the way people play during that round. All instructions on event cards and on each decade will add or subtract to the final collect made at the end of each decade.