According to the U.S.Census Bureau’s figures, Nebraska has grown in population from 1,711,263 in 2000 to 1,826,341 in 2010. This represents a population growth of approximately 6.7% in this time frame. (Of passing interest, please note that the population of the United States as a whole went from 281,421,906 in 2000 to 308,745,538 in 2010, an overall American growth for the decade of 9.7%).
According to Episcopal Church statistics, the Diocese of Nebraska went from Average Sunday Attendance (or ASA) of 4,022 in 2000 to 2,814 in 2010. This represents a decline of 30.0% during this decade.
To see a pictorial representation of some of the statistics for the diocese of Nebraska you may examine the graph here.